公开(公告)号：US20240297606A1

公开(公告)日：2024-09-05

申请号：US18663065

申请日：2024-05-14

Applicant: IHI Corporation

Inventor： Kenshiro KATSURA ,  Takehiro JIKUMARU ,  Koji YAMAGUCHI ,  Tatsuro YAMADA

IPC: H02P27/12 ,  H02P21/22

CPC classification number: H02P27/12 ,  H02P21/22

Abstract: A controller for a motor device acquires a command signal indicating a target of a drive electric power, sets a first carrier frequency and a second carrier frequency of a carrier signal based on the command signal, and generates a pulse signal to control the drive electric power, based on the command signal and the carrier signal. The carrier signal is set to the first carrier frequency in a first section corresponding to a first phase range in a period of the command signal, and to the second carrier frequency in a second section corresponding to a second phase range other than the first phase range, in which the first carrier frequency is less than the second carrier frequency.

公开(公告)号：US20240154547A1

公开(公告)日：2024-05-09

申请号：US18414299

申请日：2024-01-16

Applicant: IHI Corporation

Inventor： Koji YAMAGUCHI ,  Shota FUJISAWA ,  Toru KURIBAYASHI ,  Kenshiro KATSURA ,  Tatsuro YAMADA ,  Yoshiaki TAKAHASHI

IPC: H02P6/15 ,  H02P6/30

CPC classification number: H02P6/153 ,  H02P6/30

Abstract: An electric machine system includes an electric machine, an electric power converter, and a control unit. The electric machine includes a stator that includes coils, and a rotator that includes a magnet and is rotatable with respect to the stator. The electric power converter inputs electric power with respect to the coils of the electric machine. The control unit controls the electric power converter. The control unit includes an output unit and a correction unit. The output unit outputs a control signal for operating the electric power converter to the electric power converter. The correction unit corrects a phase of the control signal that determines input timing of the electric power with respect to the coils of the electric machine. The correction unit corrects the phase so that the magnitude of the electric power approaches an extreme value.

公开(公告)号：US20230327506A1

公开(公告)日：2023-10-12

申请号：US18336016

申请日：2023-06-16

Applicant: IHI Corporation

Inventor： Koji YAMAGUCHI ,  Takehiro JIKUMARU ,  Natsuki YONEYAMA ,  Seiichiro YOSHINAGA ,  Yosuke AKAMATSU ,  Tatsuro YAMADA ,  Tomoya KAKUTA ,  Masahiro AKIYAMA

IPC: H02K1/276 ,  H02K1/278

CPC classification number: H02K1/2766 ,  H02K1/278

Abstract: A surface magnet rotor includes a shaft member extending along a rotational axis, and a magnet portion formed around the shaft member and forming opposite magnetic poles arranged along a circumferential direction. A cross-section of the shaft member includes an intermediate line extending from the rotational axis to a center point in the circumferential direction between a d-axis and a q-axis of the magnet portion. In the cross-section, a first cross-sectional area delimited by the d-axis and the intermediate line is different from a second cross-sectional area delimited by the q-axis and the intermediate line.